Upgrading to an AC or AX router should help. Both are meant to handle more clients.

For the price, the AX50 is a good deal. It's not super expensive, and it's an AX router. AC is on the way out already, so you'd probably be better off investing in AX.

If you prefer a different brand, you can see what AX routers they have now. Some of them can be pretty pricey though.