What should I do to develop skills??

First and foremost analyse your skills like which field are you good at and which field you are not. If you want to enrich your area of interest, start from basics. Try to learn and understand theoretical concepts for that you can take online classes or get help from a professional. Do Not forget to ask for help, asking doubts and helps are the building blocks of learning.

Always keep a note for the things you learn, it will help you to brush up your skills. Always check for the newest information about your ability like if you want to become a writer try to read the writings of newly famous ones so that you can analyse the trend going on. So in general practice, until you are confident.

And help others who are in difficulties.

Skills can be developed by consistently working on them and being up-to-date about the market trend. E.g., If you want to enhance the coding skills, you need to understand what is trending in the market and what is the next big revolution and taking up classes or reading books related to it. Finding a mentor within your industry can also help you.

I would say, first of all, identify what you love to do.

Whatever you are passionate about should be the skill that you may want to develop.

For example, if you are love to teach

Go ahead and explore - is it teaching in general that you love or teaching a particular subject/topic/age group.

Once you have clarity on what is it precisely that kicks you, a gut feeling that it's something you have always wanted to do - then get back to the drawing board, and you'll have the skill that you want to develop - identified - clearly visible - in bright, sparkling colours.

Hope this helps

Take care and keep yourself safe