Since you are already comfortable with a Classic 500, you can take a look at the RE Classic / Bullet 350. These Royal Enfield bikes will be comfortable, reliable and will serve as a good upgrade from your Bajaj Avenger 220.
For similiar reasons, we would also recommend you take a look at bikes like the TVS Ronin and Honda CB350 trio. These bikes will have a somewhat similar riding experience, but are much lighter.
A test ride will help you decide which is the right option for you.

