Sleep is the toughest one to deal with always lol.
Adding TMG/Betaine (the powder is super cheap and tasteless!) was big for my daytime energy.
For sleep, taurine powder + glycine powder about 2 hours before bed is great for me. Taurine alao stimulates the flow of bile which is great on a GLP, and glycine acts as a methyl sink to help soak up excess methyl groups from the methylfolate and TMG, which helps relax you for sleep.
I can't really take nicotinic acid (flush niacin) any more due to a histamine problem, but I do recommend giving it a shot. Do some research on it, it can be quite intense if you're mot prepared! But it has a ton of benefits and also acts like a methyl sink. I sleep great after using it, and it has some wonderful benefits for cholesterol and overall health.
I haven't added CoQ10 as Ubiquinol yet, but I'm inclined to suggest it based on how promising it sounds.
Since you're a woman, you might also try adding inositol (as a blend of myo and d-chiro inositol, and not the overpriced ovasitol garbage). It's cheap and I don't notice any ill effects from it LOL.
For sleep, honestly epithalon was magical for me and I am going insane without it. I think it will be a permanent addition. Never in my life have I felt so rested. It worked so well that I legitimately thought that I had been improving my life and therefore my sleep got better... Until I ran out and everything returned to normal. 1mg a day in the evening for 20 days on 10 days off is the common wisdom for dosing.
Oh and I almost forgot... Creatine is a good add. It's quite cheap and you won't notice a difference most days, but it does help, especially to maintain muslce while on a GLP. I don't have any right now so the brands escape me, search this forum for good brands. I can't stand the texture of creatine monohydrate but it's really cheap and I hear some brands are better than others. I prefer the creatine HCL capsules but they're wicked expensive.
Also, circling back to B vitamins... I have had great success with taking all of my B vitamins separately. Riboflavin and B5 in particular give me a ton of energy, and methylfolate is a big winner as well. You may find that the doses when taking them individually are a lot more effective. I hate to admit it as a 27 year old, but I'm at the age where I simply pull open the capsules and use some of the powder if the dose is too much LOL. I still have bottles sitting around from like 5 years ago when I thought that I had to buy the highest possible dose of everything.
For my B complex, this is what I take:
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That's pretty much your core "B complex," there are all of the major cofactors for eachother. The P5P I take in the evening because I like that it causes dreaming. The methylfolate always makes me feel amazing at first, but 1000mcg is a lot so you don't have to take it every single day. I bite mine in half most days, unless I need the extra methyl donors.
For B5 I take pantothenic acid. It honestly seems a little intense at 500mg, some people take pantothine instead but I don't know the difference. This one seems to help with my circulation. For B1 you want the fat soluble active form benfotiamine. I don't notice a difference from it at all, but supposedly it has benefits and is good for transsulfuration along with B6/P5P.