This can’t be definitively answered in a short Q&A but it’s absolutely possible with the right migration plan.
It may be that since you developed your custom application years ago, something new hit the market that can do most of what you want. If that’s the case, the next step is figuring out if you can migrate your data and come up with a reasonable migration plan for your users. Many SaaS tools offer migration services as part of their onboarding. If not, it’s something Atlantic BT can help with -- from evaluating the move to planning the migration. Give us a call and we’ll help you get started!