In the startup world finding a mentor may be hard, and if you are in that situation you may want to look outside for a mentor. But if you are at a large organization, there is often a support network or mentor program already available. Take advantage of it!
If you can, ask your current manager to write a SWOT and use it to pair you up within a mentor to make strengthen your weaknesses. Try to find a mentor outside of your reporting chain.
I often suggest having an external mentor regardless, because you can be more candid with confidence that the conversation isn't going anywhere. It's easier said than done, but finding a mentor from a high performing company who is 1-2 levels above you has been really ideal for me.
If you can, ask your current manager to write a SWOT and use it to pair you up within a mentor to make strengthen your weaknesses. Try to find a mentor outside of your reporting chain.