Are there any more years on my taxes that need to be filed

We cannot answer that.  We have no access to your information.   Only you can check to see if you have past tax returns that you did not file.   Check with the IRS to see what years they have transcripts for.   If there are any past years from 2017 to the present that you did not file returns for, then it is not too late to receive tax refunds for those years.   Any refund from 2016 or earlier have been forfeited.

Each tax year has to be prepared and filed separately.   You cannot combine them in any way--not even in the same envelope.

In order to prepare past year returns you will need the W-2's or 1099's etc that were issued to you for those years.

You can get a free transcript from the IRS:   

https://www.irs.gov/individuals/get-transcript

https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return