Yes, Lukaku has made a good contribution for Inter, and Inter are also really to bring Lukaku again, reasonable Chelsea set a high price for Lukaku transfer fee. I think it seems that Inter Milan still doesn't have enough funds to bring Lukaku again from Chelsea, but rumors are that they still want Lukaku again with offered Chelsea a loan deal that contains a purchase obligation for Lukaku, and if the deal goes happen then Inter can secure Lukaku in the next new season.
The price Chelsea wants is actually only around 35-40 million for Lukaku but indeed because Inter's condition is currently in a state of trouble, especially for their finances, even though it is a price that can be said to be standard even decreased from Lukaku's previous price but Inter cannot pay that much to Chelsea.
The sale of Marcelo Brozovic for 18 million to Al Nassr also cannot cover for a Lukaku but on the other hand now Lukaku also does not want to separate from Inter so it allows them to look for other alternatives for this.
But 30 million for Lukaku at the age of 30 is not a low amount. Chelsea can ask that amount as they are not forced to sell him quickly and can be patiently waiting for Inter to make their move. If Inter can't get Lukaku, the issue of one striker that needs to be found would persist. I expect Inter to fulfill the requirements at some point, but it will probably be closer to 3= - 30 million than to 40 million as Chelsea would also want to remove Lukaku from their salary list for next season.