My cat is on the older side and I want to teach her to play

My cat is about 8 years old. To be frank, most of her life, up until recently I wasn’t completely invested in her quality of life. I had family issues, instability at work, death of my mother and much more but not the point. I would get her the best dry food I could afford, filtered drinking water and that’s it.

I realise now that she needs play, mental enrichment, and stimulation. I bought a couple cat toys and a small cat podium (I think, it’s not a tree) and I try to actively spend time with her and try to engage in her toys. However she’s not really interested.

Please give me some advice on how to improve her days, how to get her excited about toys, what toys to buy, what I can do in the time I spend with her to enrich her life.