SARMS are only minimally suppressive of natural testosterone production so all that is needed as a mini PCT after a cycle of SARMS is a good natural testosterone booster like HCGenerate ES from n2bm.com.
After the mini PCT you are safe to start your next cycle of SARMS.
Creatine would be a great supplement to add. Creatine is a really good inexpensive supplement that is very inexpensive. It's often overlooked.
Creatine is creatine. Don't waste your money on some heavily marketed creatine supplement that is going to cost 10x more but provide no additional benefits. Either get a bulk creatine monohydrate powder or a capsulated creatine supplement like ancient strength from n2bm.com.
A creatine supplement shouldn't cost an arm and a leg. Ancient strength is around $15 for a 30 day supply.
Ontop of that there are a couple supplements that I take year round
1. Fish/krill oil
2. A good quality multivitamin
3. A high quality whey isolate powder
4. digestive health supplements - greens powder, psyllium husk, probiotics and digestive enzymes