This is what I was going to suggest. Your time frame is up to 12 years of growth tax free.
I would like to 3rd this. People that do not know about this trick do not realize how amazing it is. In addition to the $19k 401k Roth or traditional contribution, you can put thousands of additional dollars into an after tax non-deductible 401k then move that to a Roth IRA, while still employed at that company! (This does not impact your ability to contribute to an ira). You can literally go broke saving money! The amount you can contribute depends on a lot of factors, all specific to your income and company, you need to carefully read the plan and talk to your 401k provider...and sadly some companies don’t allow this