Top 6 is realistic, Arsenal probably the closest to us are gradually slipping away from the top 5 which next season could make it a race between the 2 of us.
Top 4 although nice is a few seasons of investment away, the gulf between us and the top 4 teams is pretty huge but if things keep going well and we keeping building season on season then that gap will gradually narrow for us probably around the time we get our new stadium and then we can really challenge.
If we're in Europe then ideally next season we need to focus on the league primarily and see how luck goes for us in cup draws, hopefully for once it will be nice and give us an easy route to some silverware