God has plans and destinies that He has pre-set.
He pre-set the system of churches for a believer to join if they will. And these churches have a pre-set destiny. (Not talking about building by the way.. but the likes of the church at Jerusalem... Antioch.. Ephesus.. Corinth etc..)
He Has a pre-set plan for Israel in the end times.
God has pre-set entrance to heaven for whoever is convicted and then receives the Holy Spirit. Convicted by the Holy Spirit.. then the individual responds by entrusting their salvation with Jesus. An entrance to heaven is pre-set.
It is then up to the individual to build treasure in heaven.. a better place in heaven.. rather than building wood hay and stubble and being given entrance to heaven but missing rewards.
Free will part-- receiving eternal life.. God doesn't violate man's free will to save someone. He convicts them.. and then they respond. Romans 10:9-10.
So the pre-set part-- entrance to heaven set for anyone who does believe.
The free will part is the individual being faithful to God or not..determining their rewards in heaven.
But remember that God owns the salvation.. and it was given by Him. So an individuals free will can't be used to forfeit eternal life.
God HASN'T pre-set some people to get saved and the rest are eternally seperated from Him. That is violating humans will.. that isn't love.
God does give everyone person a chance to be eternally saved.
Also in God pre-setting things-- there are the covenants in the OT and their is the Abrahamic promise. These were planned in advance regardless of man's will.. but men could be part of those covenants and promises. The end of the covenants was dependent on man, but not God's plan to initiate them and His plan to maintain them.
God had and still has these figurative huge 'buses' I suppose you could call it.. that men could get on and can get on.
Some have been and gone.. like the OT system of service. Some are still in action like the NT system of service in churches.
God propels them-- He has pre-set places for them.. but men can get on them with their free will
E.g. God had a plan to re-unite Israel as one nation. Prophesied way before. This was pre-set. This though, did not mean that every single Jew then automatically were there when the nation was made one. They had to get 'on the bus' as it were. They had to go from where-ever they were around the world.. back to the former area known as Israel.
So with eternal salvation--
Yes.. entrance to heaven is pre-set for those who believe in Jesus. But that doesn't mean God automatically saves them against their will. They respond to conviction and are then given a seat on the bus to heaven.