How to reduce monotony in my life?

Here are the most useful activities to reduce monotony in your life:

Try developing daily rituals that you enjoy-- enjoy coffee in the morning, walk around at lunch, listen to music in the evening.

Brainstorm when you've historically felt like you've been "in flow", or when you feel like you're using your strengths in a way you like. Try to incorporate those activities into your routines. Increase the regularity or time of doing things you like.

Acquire a new hobby or new skill, possibly with new people! Look around to see what classes or clubs are available locally. Try gardening, salsa dancing, soccer. Challenge yourself.

Try a new experience! Try to spend money on experiences, not objects-- plan a trip for yourself that you've always wanted to do.

Select those that you feel are most relevant!