You must read House of X / Powers of X, by Jonathan Hickman, especially if you liked Claremont's peak and Morrison's run with the franchise. It's a stunning reset of the X status quo, and every X book after HoX/PoX for the next two years (barring one or two) is a banger. After Hickman's mini Inferno concludes and he leaves the X-Office, the quality gets a little more erratic, but the X-line remains the best thing going about Marvel right now. Immortal X-Men and X-Men: Red, by Kieron Gillen and Al Ewing respectively, are incredible books that are currently ongoing. Leah William's X-Factor (tragically cut short by the pandemic) is great, as is Ewing's S.W.O.R.D. For awesome one shots, check out Planet-Sized X-Men #1 and Giant-Size X-Men: Jean Grey and Emma Frost. However, if you only read one series after HoX/PoX, make it Zeb Well's Hellions, imo. Though it helps if you're familiar with 80's Claremont. Hilariously, this era of the X-Men was getting started just a little bit after you made this thread, so it's possible that you already read some of those.
Jed McKay's current run on Moon Knight is the second best run other than Warren Ellis (vomit). Lots of fun, especially if you know a lot of the history of the character. McKay's Black Cat is a heist comic that is a great easy and fun read, too. As as his 5 issue Taskmaster mini.
Al Ewing's 50-issue run of Immortal Hulk from a couple of years ago is maybe the best 50 issue run of any comic writer/group of artists in the history of the medium. It single-handedly made me give a shit about the Hulk for the first time in my life. And if you like body horror...hoo boy does this series have it.
Rainbow Rowell's current ongoing She-Hulk is a lot of a fun, and a nice change of pace from your typical hero books. Some lawyering, some romantic comedy, some fun capers. Highly recommend.
I don't read much DC, but Tini Howard's Catwoman is cool.