Second this. I used to regularly jump back into my upvotes on Apollo to send links / references.

Im not an expert by any means but I noticed with my cacti and succulents that potting them in the correct type of soil makes a huge difference. If you have a local nursery, they may have some nice soil for you.

I hope this helps!

Oh also, I have a miracle grown succulent food I give them periodically. Maybe grab something like that as well.