Hire a web developer from freelancer?

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Apart from Js and CSS files, you can optimize other things like image optimization, meta tag optimization, etc. and also checks your website in other major tools and fix the issues that can be possible from your end.

For become a successful blogger, you need to learn these languages. Without js and CSS you could face lots of problem in the future when your blog will grow day-by-day.

If you have a budget, then don't waste your time, hire a professional developer for your blog and fix all these issues.

As we know, Google loves error free website or blog and gives more value in their ranking. So we can't ignore these types of such issues.

you can hire a freelancer to fix the issue. you can check with toptal website

If you're using wordpress, you should made a change to the theme core.. Or change your theme to responsive wordpress theme..

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If your website is based on WordPress platform then use Better WordPress Minify plugin (Before using this plugin always take the backup of theme and database)

hi mate, minify your JAVA and CSS

Google Insight is Best speed checker Tool to help you suggest that you have to do minify some JS and CSS and Images. Google Insight tool amazing and it also free .........

I would like to recommend you this article How to Optimize CSS and JavaScript Delivery - Deep Tutorials
This is a detailed instruction how to optimize your Javascript and CSS files!

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first of all u want to check image compresed and delete some js and css file.

The best solution to your problem is hire a professional developer who can fix the problem. This will save you a lot of time and let you focus on other blogging-related tasks.